Gibbs Free Energy changes for reactions

DHo DSo DGo Reaction

exo (-) increase(+) - Product-favored

endo(+) decrease(-) + Reactant-favored

exo (-) decrease(-) ? T dependent

endo(+) increase(+) ? T dependent

Spontaneous in last 2 cases only if

Temperature is such that ?Go < 0

DGo = DHo - TDSo

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